/*by czt*/

.clearfix::after{
    content: "";
    display:block;
    clear:both;
}

body{
    background: url("../images/reader_searchbook.jpg") no-repeat ;
    background-attachment: fixed;
    background-size:cover;
    background-color: #000;
    margin: 0;
    min-height: 100%;
}

.main{
    width:100%;
}

.header{
    position: fixed;
    min-width: 600px;
    width: 100%;
    left: 0;
    top: 0;
    background: #000000;
    height: 27px;
    line-height: 27px;
}

.header i{
    float: left;
    color : #fff;
    font-size:23px;
    margin-left:10px;
    line-height: 27px;
}

.header a{
    color:#fff;
    text-decoration: none;
    line-height: 27px;
    margin-left: 2em;
}

.header .topmenu{
    margin: 0;
    display: inline;
}
.header .topmenu>li{
    list-style: none;
    float: right;
    margin: 0 20px;
    width: 150px;
    text-align: center;
}

.header .topmenu .identify{
    background: black;
    width: 190px;
    height: 54px;
    display: none;
}
.header .topmenu  .arrow{
    background: url(https://p.ssl.qhimg.com/t013dbf3f21a941fa54.png) no-repeat;
    background-image: -webkit-image-set(url(https://p.ssl.qhimg.com/t013dbf3f21a941fa54.png) 1x,url(https://p.ssl.qhimg.com/t014fa26df477bb0a5e.png) 2x);
    background-size: 12px 8px;
    display: inline-block;
    font-size: 0;
    height: 8px;
    line-height: 0;
    margin: -1px 0 0 5px;
    vertical-align: middle;
    width: 12px;
}
.header .topmenu .identify div{
    text-align: center;
    border: 1px solid #7f7f7f;
}

.header .topmenu .identify div>a{
    margin-left: 0;
}

.header .topmenu>li:hover .identify{
    display: block;
}

.search-box{
    position: absolute;
    left:50%;
    top:50%;
    transform: translate(-50%,-50%);
    height: 40px;
    width: 700px;
}

.search-box i{
    position: absolute;
    left: 9%;
    top:25%;
    z-index: 1;
}

.search-box input{
    position: absolute;
    left: 8%;
    width: 500px;
    height: 2.5em;
    border-radius: 40px;
    padding-left: 3.5%;
    outline: none;
}

.search-box button{
    position: absolute;
    right: 0%;
    top: 8%;
    width: 80px;
    height: 2.5em;
    background: black;
    color: white;
    border-style: none;
}

.footer{
    width: 100%;
    background-color: black;
    margin-top: 23%;
    position:fixed;
    bottom: 0;
    left:0;
    height: 100px;
}

.footer .mandarin{
    position: absolute;
    width: 250px;
    height: 90px;
    border-radius: 50%;
    overflow: hidden;
    left:50px;
    top: 5px;
}

.footer .mandarin img{
    position: absolute;
    width: 100%;
    height: 100px;
    left: 50%;
    top:50%;
    transform: translate(-50%,-50%);
}

.footer p{
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%,-50%);
    color: #7f7f7f;
}

#tanchuceng{
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100vh;
    background:rgba(0,0,0,0.5);
    z-index: 1;
    display: none;
}

#tanchuceng #msg{
    position: absolute;
    left: 50%;
    top:50%;
    transform: translate(-50%,-50%);
    width: 400px;
    height: 200px;
    background: linear-gradient(90deg,#f6e58d,#f9ca24,#ffbe76,#f0932b);
}

#tanchuceng #msg #exit{
    background: #f6e58d;
    color: black;
    position: absolute;
    right: -6px;
    top:-10px;
    border-radius: 50%;
    width: 20px;
    text-align: center;
    line-height: 20px;
    height: 20px;
    cursor: pointer;
}

#tanchuceng #msg p{
    text-align: center;
    line-height: 200px;
    margin: 0;
}